Process of and means for drying paper



Nov. 9 1926. 1,606,310 v D. I... MCCORKINDALE PROCESS OF AND MEANS FOR DRYING PAPER Filed Feb. 6. 1926 I N V EN TOR.

A TTORNE Y.

Patent Nov. g, 1926.

Duncan 1.; McCORKINDALE, or HOIYOKE, massacnusarrs.

PROCESS OF AND MEAN S FOR DRYING PAPER.

Application filed February 6, 1926. Serial No. 86,478.

My invention relates to improvements in the art of drying paper after it has received its bath of sizing, and the process consists primarily in carrying the paper between two felts under and over hot cylinders, and secondarily in passing the paper in direct contact with other hot cylinders, and in subv jectingthe paper to'a cooling blast or blasts of air, the air blasts not being necessary in' some cases, and the subjecting of the pa er to the direct action thereon of hot cylin ers not being necessary in some cases, in other words, either or both of the secondary steps 7 may be omitted, while-the means comprises,

with a size box and size rolls, a luralityv of upper and under drying cylin ers and upper and under felts passing over and under the same; and preferably an additional drying. cylinder or cylinders, which I term conditioning driers, and suitable conduits forvdischarging the cool air onto the paper, all as hereinafter set forth.

The primary object of my invention is to. provide a process of and means for drying paper, and especially hi 'h-grade paper, after the same has received the siz ing, inv a continuous operation, and in a manner to prevent the evaporation of the sizing, and to cause said sizing to become set in the paper before the latter can come into direct paper is dried by the so-called method of pole drying, to reduce the time consumed in the rying process to an immediate delivery, and to produce results equal ,to or better than those produced by the aforesaid w pole-drying method.

Other objects and advantages .Will appear in the course of the following description.

In carrying out my rocess, I prefer to make use of means suc as are illustrated in the accompanying drawing, which is a diagrammatical view of the parts and members of a machine that embodies a practical. form ofmy invention from a mechanical standpoint.

The lefthand end of the machine illustratedin the drawing is to be considered as the front end thereof, and the right-hand end the rear end thereof.

In the drawing, a size box is represented at 1, guide rolls at 2-2, upper. and under size rolls at 3, six drying cyliiiders at 4, three of such cylinders bein above and in offset relationship to the other three, upper and under or top and bottom felts at 5 and 6, respectively, five guide rolls at 7 for said up. per felt, and the same number of guide rolls at 8 for said lower felt, a pair of condition-- mg driers at 9 and an associated guide rill at 10, another guide roll at 11, upper a (1 under slitters at 12, and an air pipe at 13 which has two discharge nozzles 14 and 15. A web of paper is designated by the nun1eral16.

The size box 1 is at the front end of the machine. One of the guide rolls 2 is atthe entrance to said box, and the other guide roll 2 is above the upper size roll 3. The lower size roll 3 is partly submerged in the sizing in thebox. Y

The top felt 5 passes under each of the lower drying cylinders 4 and over each of the upper drying cylinders 4, and upwardly from the first lower drying cylinder 4 to andover the first guide roll 7, rearwardly from said roll to the third guide roll' 7, partly around said third roll and-forwardly to the second guide roll 7, partly around said second .roll and 'rearwardly to the fourth guide roll 7, over said fourth roll and downwardly to and under the fifth guide roll 7, and upwardly to the third upper dry.- ing cylinder. The bottom felt 6 passes from the first guide roll 8 downwardly and rearwardly under the felt 5 on the first bottom drying cylinder 4, upwardly and over the first upper drying cylinder 4, between the same and the felt '5 thereon, downwardly".

and under the felt 5 on the second lower dryin cylinder 4, upwardly and over the secon drying cylinder 4, between the same and the felt 5 thereon downwardly and under the felt 5 on thethird lower drying cylinder 4 and upwardly and over'the third up er dryin cylinder 4, between'the same an the fel 5 thereon, and downwardly under the fifth ide roll 8, forwardly to and up over the t ird guide roll 8, rearwardl to and up 'over the fourth guide roll 8, fbrwardly to and under the second guide roll 8, and upwardly to and over said first ide roll. Thus it is seenthat the parts of l e drying cylinders 4 with which the web conditioning or paper 16 would ordinarily come in contact are covered with the two felts 5 and 6, and that said paper-must, therefore, in passing in its tortuous course under and over said drying cylinders, in the manner presently to be explained, be carried between said felts and thereby prevented from coming into direct contact with the cylinders. The drying cylinders 4 are heated in the usual manner, and there may be more or less than six of them.

The drying cylinders 4; and the felts 5 and 6, with the guide rolls for said felts, are behind the size box 1 and size rolls 3. The driers 9 are 7 steam-heated drums or cylinders, and they with the guide roll 1.0 are behind the drying c linders 4 and the felts 5 and 6, and one-o said conditioning driers is directly behind the other, while said guide rollis above the space between the two driers. There may be more or less than two of the driers 9.

The air pipe 13 is below the guide roll 11, and the latter is above and a little behind the rear conditioning drier 9. The nozzles 14 and 15, with which the pipe 13 is provided, are arranged and adapted to discharge air onto the front and back sides, respectively, of the paper 16 as it passes upwardly from the rear conditioning drier 9 to the guide roll 11.

The slitters 12 are arranged one'above the other, and the bottom slitter is directly behind the guide'roll -11.

The Web of paper 16 enters the size box- 1 beneath the guideroll 2, and passes rearwardly under the bottom size roll 3 and up over and between said roll and the size roll- 3 above. The rolls 3 press out the surplus sizing'from the paper 16 as it passes between said rolls, in thecustomary manner,

From the upper size roll 3 the paper 16 passes up over the second guide roll 2, rearwardly' and downwardly .onto the bot-' tom felt 6 at the lace where said felt passes over the first guide roll 8 and downwardly and rearwardly with said felt to the lace where the two felts run together in ront of the first lower drying cylinder 4. From der 4 the paper passes down with the topfelt 5 in front of the fifth guide roll 7, and then continues on downwardly to the front conditioning drier 9 under which it. passes. The paper then asses up over the guide roll 10, down an er the rear conditioning drier 9, up over the guide roll 11, and rearwardly between the slitters 12. It is while the paper is passing from the rear conditioning drier 9 to the guide roll 11 that the cold air is discharged onto one or both sides thereof. By closing a valve 17 with which each of the nozzles 14 and 15 is provided, the air may be shut oil from one or the other of said nozzles, and thus applied to one side of the paper only, a condition which may be desired or required in some cases.

prepared by them for such contact, and the drying is thus completed, or, if not, the cool air is turned on and discharged onto the paper as soon as it leaves the rear conditioning drier.

The arrangements of the guide .rolls 7 and 8, whereby the felts 5 and 6 are caused to travel considerable distances exposed to the air, is for the purpose of removing or eliminating moisture from said felts, and keeping them in condition to dry the paper and the sizing thereon and therein as said paper passes in contact with the felts.

Preferably one of the felts is made of wool of a coarse texture.

If it be not desired to heat the paper after it leaves the felts 5 and 6, the live steam is not turned into the conditioning driers 9,

the conditioning driers would never be re quired, they might be omitted from the machine and other guiding elements for the paper substituted tharefor; and, in the event no air blasts would ever be needed, the pipe 13 would be omittedrbut preferably both 2,

the heated felts orfelts which pass over hot drying cylinders; and that specifically said process consists in passing the paper from the size rolls between felts that are carried 'on hot drying cylinders, in passing said paper from said felts in direct contact with a hot conditioning drier :or driers, and in passing said paper from said driers through or subjecting it to cooling blasts of air, or in passing the aper in direct contact with the heated conditioning driers without subjecting the same to the air blasts, or in subjecting the paper to the air blasts Without first carrying the same in direct contact with heated driers.

ing said paper from said felts into direct contact on one side with heated rotating conditioning driers while the other side of said paper is exposed to the air. 0 2. A process of drying paper consisting in passing the paper, after sizlng has been appliedthereto, between felts carried on heated drying cylinders, in guiding said paper from said felts to slitters and in blowing air onto said paper before it reaches said slitters.

3. A process of drying paper consisting in passing the paper, after sizing has been applied thereto, between traveling felts 'carried on heated drying cylinders, and in guiding said paper from said felts through air currents.

4. A process of drying paper consisting in passing the paper, after having sizing applied thereto, between traveling felts carried on heated drying cylinders, in guiding said paper from said felts to slitters, and in subjectin the paper on both sides to blasts of air be ore it arrives at said slitters.

5. A process'of drying-paper consisting in passing the paper, after sizing has been applied thereto, between moving felts carried on heated drying cylinders, in passing said felts in direct contact with heated conditioning driers, and in subjecting said paper to air currents after it leaves said condition ing driers.

6. In means for drying paper after sizing has been applied to the same, a plurality of dr ing cylinders, felts carried by said cylindiers and adaptedto receive between them the paper after sizing has been applied thereto, rolls arranged to guide said felts to and from said cylinders, and a conditioning drier, back of said drying cylinders, to receive the paper in direct contact therewith after it leaves said felts, the paper being I held by the/pull thereon against said conditioning dfrier so that one side of the is exposed to the air.

7. In means for drying paper, a plurality of drying cylinders, felts carried by said paper I cylinders and adapted to receive between them the paper after sizing has been applied thereto, rolls to guide said felts to and from said cylinders, slitters, means to guidethe paper from said felts to said slitters, and means to project air onto said paper before itreaches said slitters. A

8. In means for drying paper, a plural-- ity of drying cylinders felts carried by said cylinders and adapted to receive between them the paper after-sizing has been applied thereto, rolls to guide said felts to and from said cylinders, a conditioning drier with which said paper is carried in direct contact after leaving said felts, slitters, and

means to project air onto said paper at a point between said conditioning drier and said slitters. a

9. The combination, in means for drying paper, with a size box, andsize rolls, of a lurality of dryin cylinders, felts carried y said cylinders, between which felts the paper is adapted to pass after receiving sizing from said rolls, rolls to guide said felts to and from said cylinders, conditioning driers, behind said cylinders,-to-receive in direct contact therewith the paper after it leaves said felts, slitters, and meansinters medate of said driers and said slitters. to project air onto the paper.

DUNCAN L. MOCORKINDALE. 

